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taud: extended tempo range

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minjaesong
2026-06-20 04:00:33 +09:00
parent 1173373789
commit 6eb73355ca
11 changed files with 101 additions and 49 deletions
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9
taud_common.py
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@@ -452,18 +452,23 @@ def encode_song_entry(song_offset: int, num_voices: int, num_patterns: int,
Layout:
u32 song_offset, u8 num_voices, u16 num_patterns,
u8 bpm_stored, u8 tick_rate,
u8 bpm_stored, u8 bpm_hi_bit<<7 | tick_rate,
u16 base_note, f32 base_freq,
u8 flags, u8 global_vol, u8 mixing_vol,
u32 pat_bin_comp_size, u32 cue_sheet_comp_size,
byte[6] reserved.
`bpm_stored` is `bpm - 25` and may be a 9-bit value (0..510 ⇒ BPM 25..535);
its low 8 bits go to the bpm byte and bit 8 is packed into bit 7 of the
tick-rate byte (which therefore caps tick_rate at 0..127). See terranmon.txt.
"""
bpm_stored = max(0, min(0x1FE, bpm_stored))
entry = struct.pack('<IBHBBHfBBBII',
song_offset,
num_voices & 0xFF,
num_patterns & 0xFFFF,
bpm_stored & 0xFF,
tick_rate & 0xFF,
(((bpm_stored >> 8) & 1) << 7) | (tick_rate & 0x7F),
base_note & 0xFFFF,
float(base_freq),
flags_byte & 0xFF,